Now a new video shows his latest construction: a
gravity-defying roof that seems to attract and balance balls on its edge. When the house is rotated, its true form is revealed.

According to Sugihara, this type of ambiguous shape is
interesting because we perceive the illusion again even after we have seen what
the object really looks like. After studying a variety of these objects, he concludes that
our brain seems to choose the most rectangular configuration when it tries to
make sense of features that can have different interpretations.